Masonry drill and starter
United States Patent 2858109
US Patent References:
Drill
- - 1401353

Mining drill
- - 2341237

Starting bit for rotary masonry bits
- - 2673717


Inventors:
Tengberg, Evert R.
Publication Date:
10/28/1958
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Assignee:
New, England Carbide Tool Compa
Primary Class:
175/386
Other Classes:
408/223, 175/394, 175/426, 175/404
International Classes:
B23B51/04